dd33e89fb2
1997-04-17 16:55 Ulrich Drepper <drepper@cygnus.com> * misc/libgen.h: Change prototype for of basename to XPG variant. * stdlib/Makefile (routines): Add xpg_basename. * stdlib/basename.c: New file. * string/string.h: Don't declare basename function if basename macro is available. 1997-04-16 17:33 Miles Bader <miles@gnu.ai.mit.edu> * login/utmp_file.c (proc_utmp_eq): Only use ut_id field if valid. 1997-04-15 12:47 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/m68k/fpu/fclrexcpt.c: New file. * sysdeps/m68k/fpu/fenvbits.h: New file. * sysdeps/m68k/fpu/fegetenv.c: New file. * sysdeps/m68k/fpu/fegetround.c: New file. * sysdeps/m68k/fpu/fesetenv.c: New file. * sysdeps/m68k/fpu/fesetround.c: New file. * sysdeps/m68k/fpu/feupdateenv.c: New file. * sysdeps/m68k/fpu/fgetexcptflg.c: New file. * sysdeps/m68k/fpu/fraiseexcpt.c: New file. * sysdeps/m68k/fpu/fsetexcptflg.c: New file. * sysdeps/m68k/fpu/ftestexcept.c: New file. * sysdeps/m68k/fpu/mathbits.h: New file. * sysdeps/m68k/fpu/s_remquo.c: New file. * sysdeps/m68k/fpu/s_remquol.c: New file. * sysdeps/m68k/fpu/s_remquof.c: New file. * sysdeps/libm-ieee754/s_roundl.c: Restore integer bit when mantissa overflows into exponent. Fix priority of >> vs +. * math/libm-test.c (basic_tests): Use the appropriate isnan and isinf function to test the value of the nan function. 1997-04-15 13:40 Ulrich Drepper <drepper@cygnus.com> * sysdeps/libm-i387/s_finite.S: Fix typo. * sysdeps/i386/fpu/__math.h: Add optimized versions of isgreater, isgreaterequal, isless, islessequal, islessgreater, and isunordered.
107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
/* Round long double to integer away from zero.
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Copyright (C) 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <math.h>
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#include "math_private.h"
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static const long double huge = 1.0e4930;
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long double
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__roundl (long double x)
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{
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int32_t j0;
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u_int32_t se, i1, i0;
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GET_LDOUBLE_WORDS (se, i0, i1, x);
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j0 = (se & 0x7fff) - 0x3fff;
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if (j0 < 31)
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{
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if (j0 < 0)
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{
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if (huge + x > 0.0)
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{
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se &= 0x8000;
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i0 = i1 = 0;
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if (j0 == -1)
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{
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se |= 0x3fff;
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i0 = 0x80000000;
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}
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}
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}
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else
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{
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u_int32_t i = 0x7fffffff >> j0;
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if (((i0 & i) | i1) == 0)
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/* X is integral. */
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return x;
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if (huge + x > 0.0)
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{
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/* Raise inexact if x != 0. */
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u_int32_t j = i0 + (0x40000000 >> j0);
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if (j < i0)
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se += 1;
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i0 = (j & ~i) | 0x80000000;
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i1 = 0;
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}
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}
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}
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else if (j0 > 62)
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{
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if (j0 == 0x4000)
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/* Inf or NaN. */
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return x + x;
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else
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return x;
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}
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else
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{
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u_int32_t i = 0xffffffff >> (j0 - 31);
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if ((i1 & i) == 0)
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/* X is integral. */
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return x;
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if (huge + x > 0.0)
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{
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/* Raise inexact if x != 0. */
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u_int32_t j = i1 + (1 << (62 - j0));
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if (j < i1)
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{
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u_int32_t k = i0 + 1;
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if (k < i0)
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{
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se += 1;
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k |= 0x80000000;
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}
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i0 = k;
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}
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i1 = j;
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}
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i1 &= ~i;
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}
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SET_LDOUBLE_WORDS (x, se, i0, i1);
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return x;
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}
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weak_alias (__roundl, roundl)
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